A can do a piece of work in 4 days. B can do it in 5 days. With the assistance of c theycompleted the work in 2 days. Find in how many days can c alone do it?
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a+b+c can completed in 1 day = 1/2 of the work
c can complete in 1 day = 1/2-1/4-1/5
=1/20
c can complete whole work in 20 days
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